Expose API to store and load data usage stats from UI task runner.

chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc

Index: chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc
diff --git a/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc b/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc
index 0459ded60bc057c0e1af30094916a8f896c44c11..193a12e4c3bbf26615869cca602308b9d5698521 100644
--- a/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc
+++ b/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc
@@ -7,6 +7,7 @@
 #include <string>
 
 #include "base/base64.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/prefs/pref_service.h"
@@ -23,6 +24,7 @@
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_service.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h"
+#include "components/data_reduction_proxy/core/browser/data_store.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
 #include "components/proxy_config/proxy_prefs.h"
 #include "net/base/host_port_pair.h"
@@ -176,7 +178,9 @@ void DataReductionProxyChromeSettings::InitDataReductionProxySettings(
     data_reduction_proxy::DataReductionProxyIOData* io_data,
     PrefService* profile_prefs,
     net::URLRequestContextGetter* request_context_getter,
-    const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner) {
+    scoped_ptr<data_reduction_proxy::DataStore> store,
+    const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner,
+    const scoped_refptr<base::SequencedTaskRunner>& db_task_runner) {
 #if defined(OS_ANDROID) || defined(OS_IOS)
   // On mobile we write Data Reduction Proxy prefs directly to the pref service.
   // On desktop we store Data Reduction Proxy prefs in memory, writing to disk
@@ -189,13 +193,13 @@ void DataReductionProxyChromeSettings::InitDataReductionProxySettings(
 #endif
 
   scoped_ptr<data_reduction_proxy::DataReductionProxyCompressionStats>
-      compression_stats = make_scoped_ptr(
+      compression_stats(
           new data_reduction_proxy::DataReductionProxyCompressionStats(
               profile_prefs, ui_task_runner, commit_delay));
   scoped_ptr<data_reduction_proxy::DataReductionProxyService> service =
       make_scoped_ptr(new data_reduction_proxy::DataReductionProxyService(
           compression_stats.Pass(), this, profile_prefs, request_context_getter,
-          io_data->io_task_runner()));
+          store.Pass(), io_data->io_task_runner(), db_task_runner));
   data_reduction_proxy::DataReductionProxySettings::
       InitDataReductionProxySettings(profile_prefs, io_data, service.Pass());
   io_data->SetDataReductionProxyService(